it s the gravitational pull of the moon, and to some extent the sun, which gives the tides their rhythm. and unlike wind, solar or hydro, tidal power isn t reliant on weather. while tidal barrages have been around for decades, their cost and the ecological impact has been a barrier. now, from the scottish islands through to canada, a new generation of tech firms have introduced tidal stream turbines. 0cean energy is still largely untapped, so what are the barriers that have prevented it from taking off? it s a relatively small and new industry, so very few machines in the water, and then you have to compete with wind farms and solar pv, etc. we re now addressing a resource that s so much larger, so we re opening up a market that didn t even exist before. if all goes to plan, there could be arrays of subsea kites around the faroe islands, installed in groups similar to wind farms. so this machine here,